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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4a636e77bc80b3ae99ef09568ba1a7f50a0f9901e39469a7054673aa443634' 
  AND token = '5Q+rBh+PoJ6aIKPBfK97hV/s7N8GmyRGgeeZcuSdKus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}